Friday, December 04, 2015

How to enter to service mode Panasonic TX-32LX70P - TX-26LX70F Led blinking code and voltage adjustments


Contents in this article 

  • Service mode ( Factory adjustment mode )
  • Causes of Standby led flashing 
  • Subcontrast adjustment 
  • White balance adjustment 
  • Voltages at the different part of circuit board 


PANASONIC TX-32LX70P - TX-26LX70F 

SERVICE MODE LED BLINKING CODE AND VOLTAGE ADJUSTMENTS 


Service Mode Function
MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can be adjusted by remote control in Service Menu.
How to enter to service mode 
While pressing (-/v) button on the TV unit, press on the remote control for 3 times within 2 seconds.
Note:
To exit from Service mode, press the exit button on remote control.
Key Command
# Press the 3/4 button to change the adjustment values or function.
# Press the 1/2 button to step up/down through the functions and adjustments
# Press the numerical button VOLUME (+/-) to change of each option item.
# Press the OK button after each adjustment has been made to store the required values.
Subcontrast adjustment
1. Receive PAL colour bar (100% white) RF signal.
2. Enter “Contrast” adj. In SERVICE mode.
3. Start adjusting by using Yellow Key.
4. If the adjustment finished normally, the letter of Contrast will change from red to black.
White Balance adjustment
1. Procedure basically performs checking using the production software and make automatic adjustment using external computer.
2. It adjusts in the mode of: Colour balance Normal Viewing Mode Dynamic

VOLTAGE ADJUSTMENTS 
AP board
Description
Test point
Position
Normal mode
Stand by mode
Sound_Vcc
TP7302
AP3, pin 2,3
15V +/- 0,8V
Max 5V
DTV_9V
TP7502
AP3, pin 17,18
9,1V +/- 0,45V
Max 3V
Sub_5V
TP7402
AP3, pin 21,22
5,1V +/- 0,25V
Max 2V
Main_9V

AP3, pin 23
9,1V +/- 0,45V
Max 3V
LCD_3.3V
TP7602
AP4, pin 16,17
3,3V +/- 0,16V
Max 2V
STB_5V
TP7103
AP4, pin 3
5,1V +/- 0,25V
5,1V +/- 0,25V
Panel 12V
TP7702
AP4, pin 11,12
12,2V +/- 0,6V
Max 4V

P board
Description
Test point
Position
Normal mode
Stand by mode
5Vs
TP823
P8, pin 1
5,1V +/- 0,25V
5,1V +/- 0,25V
24V
TP825
P5, pin 1-3
24V +/- 2V
Max 4V

DG board
Description
Test point
Normal mode
Sub1,2V
TP5601
1,17V - 1,32V
Sub1,8V
TP5602
1,7V - 1,9V
Sub3,3V
TP5600
3,14V - 3,46V
MHQ1,2V
TP4209
1,1V - 1,3V

Power LED blinking
When abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by number of blinking of the Power LED on the front panel of the unit.
Blinking times
Contents
Check point
1

INVERTER_SOS

DG BOARD
LCD PANEL
2

FAN_SOS

H BOARD
DG BOARD
3

BT_30V,SOUND 15V
PANEL 12V, HQ_ 3.3V
H BOARD
AP BOARD,DG BOARD
4

DTV_9V

AP BOARD
H BOARD, DG BOARD
5

MAIN_9V

AP BOARD
H BOARD, DG BOARD
6

SUB_5V

AP BOARD
H BOARD, DG BOARD
7
MAIN_5V
DG BOARD
8
MAIN_3.3V
DG BOARD
9

SOUND_SOS

H BOARD
DG BOARD
10
HQ1L_SOS
DG BOARD